。
She's suffering, driven by jealousy.
Literal
She [topic-は] jealousy [by-に] driven suffering is.
かられる (駆られる) means 'to be driven by' or 'to be seized by' an emotion — a powerful expression for being compelled by feeling rather than reason. 嫉妬にかられて (driven by jealousy) treats jealousy as an external force acting upon her. 苦しんでいる (is suffering) with ~ている marks ongoing torment. The sentence paints jealousy as an almost physical affliction.